a stupid or slow-thinking person.
Lexical Investigations: WitThough today we most often think of wit as a particular kind of humor, historically it has referred more generally to mental faculty. In the time of Chaucer, for example, wit could mean a way of thinking, much as we use mind today in phrases like “we were of one mind” or “he had a mind to.” For many centuries, wit could also refer to …
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Origin of dimwit
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for dim-witted
On the demand side, the number of pleasure-seeking, dim-witted young adults who have not been touched by mortality is endless.
informal a stupid or silly person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper